no, on these diesel coaches, like mine, it's likely that the engine does not need to be running, only that the 'ignition' is in the 'on' position, though most folks WILL run their leveling system while the engine is still on.
also, since the air brakes are certainly already pulled to keep the coach still, there's no issue with that. If, though, you try to move the coach(put it into gear) while the legs are still deployed, the emergency alert and alarms will go off, and the system will bring up the legs automatically.... as my LCI LevelUp system does.
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada - Hiawassee, GA! (also, '14 Gulfstream Amerilite and '07 ForestRiver Rockwood) : )